#include<stdlib.h>
#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<unistd.h>
#include<fcntl.h>

int main(int argc,char **argv){

   int fd;
   char buf[1024] = "error who are you\n";
   
//    fd = open("/dev/pts/0",O_WRONLY|O_CREAT|O_TRUNC);
   write(2,buf,sizeof(buf));
//    write(fd,buf,sizeof(buf));
   close(fd);



   return 0;
}